New Castle County is a county in the state of Delaware in the United States. The county is in the north part of the state. The county seat is Wilmington. New Castle County had 570,719 people in 2020.^[1]

v t e Municipalities and communities of New Castle County, Delaware, United States
County seat: Wilmington
Cities	Delaware City New Castle Newark Wilmington
Towns	Bellefonte Clayton‡ Elsmere Middletown Newport Odessa Smyrna‡ Townsend
Villages	Arden Ardencroft Ardentown
CDPs	Bear Brookside Claymont Edgemoor Glasgow Greenville Hockessin North Star Pike Creek Pike Creek Valley Port Penn St. Georges Wilmington Manor
Unincorporated communities	Anglesey Armstrong Ashland Auburn Hills Augustine Beach Avalon Basin Corner Beaver Valley‡ Bellevue Belvedere Biddles Corner Blackbird Blue Ball Boyds Corner Brackenville Brackenville Woods Brandywine Brookhill Farms Canby Park Estates Canterbury Hills Carpenter Centerville Christiana Church Hill Cleland Heights College Park Collins Beach Collins Park Corner Ketch Cornish Hills Delaware Heights Dunleith Elmhurst Fairfax Fairfield Fairfield Crest Farnhurst Faulkland Fieldsboro Flemings Landing Fox Meadow Gateway Farms Granogue Greenbank Greenville Manor Guyencourt Hanbys Corner Hares Corner Haverford Heather Valley Henry Clay Hickory Hill Highland Meadows Highland West Holloway Terrace Holly Knoll Kirkwood Lancaster Court Landenberg Junction Landlith Loveville Marshallton Mathews Corners McClellandville McDonough Meadowbrook Mechanicsville Meeting House Hill Milford Crossroads Mill Creek Milltown Minquadale Mockingbird Hills Monroe Park Montchanin Mount Cuba Mount Pleasant Naaman Oakwood Hills Ogletown Penn Rose Pennyhill Pleasantville Porter Prices Corner Quaker Hill Red Lion Rockland Runnymeade Sedgley Farms Silverbrook Silverbrook Gardens Silview Smyrna Landing‡ Southwood Spring Valley Stanton State Road Summit Bridge Swallow Hill Talleys Corner Talleyville Taylors Bridge Trepagnier Tybouts Corner Walnut Ridge Ways Corner Wellington Hills West Farm West Haven West Park Westgate Farms Westminster Westover Hills White Briar Williamsburg Winterbury Winterthur Wooddale Wrangle Hill Yorklyn
Hundreds	Appoquinimink Blackbird Brandywine Christiana Mill Creek New Castle Pencader Red Lion St. George's White Clay Creek Wilmington
Ghost towns	Airport Villa Glenville
Footnotes	‡This populated place also has portions in an adjacent county or counties

v t e State of Delaware
Dover (capital)
Topics	Index Architecture Beaches Communications Delegations Geography Government History Images Landmarks Law Mass media Newspapers Radio TV Military Music Nature Organizations Parks Roads Sports Symbols Transportation Tourist attractions
Society	Culture Crime Demographics Economy Education Party strength Politics
Cities	Delaware City Dover Harrington Lewes Milford Newark New Castle Rehoboth Beach Seaford Wilmington
Towns	Arden Ardencroft Ardentown Bellefonte Bethany Beach Bethel Blades Bowers Bridgeville Camden Cheswold Clayton Dagsboro Delmar Dewey Beach Ellendale Elsmere Farmington Felton Fenwick Island Frankford Frederica Georgetown Greenwood Hartly Henlopen Acres Houston Kenton Laurel Leipsic Little Creek Magnolia Middletown Millsboro Millville Milton Newport Ocean View Odessa Selbyville Slaughter Beach Smyrna South Bethany Townsend Viola Woodside Wyoming
Counties	Kent New Castle Sussex

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